Tacoma here. I kept getting hand typed notes in my mailbox for a few months to join NextDoor. Looked it up once and never went back. Too many dogwhistle posts about "undesirable youth" causing all the city's problems.
Why don't you call it out? Like it seems that this stuff gets going because nobody ever raises their hand and says something, so the people who are left just get into a feedback loop.
Because all that will do is create high school style drama about who's more correct.
But if you want to get into an eternal hate match between your neighbors full of passive aggressive backstabbing, there is no quicker way than to call them out on their causal racism.